「男の人 (おとこのひと)」 means "man." This term refers to an adult male person. It's a polite and general way to distinguish males from females. You can use it to refer to any man you see or talk about.

成人(せいじん)の男性(だんせい)を指(さ)します。あそこに男(おとこ)の人(ひと)がいます。